Reaver implements a brute force attack against Wifi Protected Setup (WPS)
registrar PINs in order to recover WPA/WPA2 passphrases, as described in
http://sviehb.files.wordpress.com/2011/12/viehboeck_wps.pdf.
Reaver has been designed to be a robust and practical attack against WPS, and
has been tested against a wide variety of access points and WPS
implementations.
On average Reaver will recover the target AP's plain text WPA/WPA2 passphrase
in 4-10 hours, depending on the AP. In practice, it will generally take half
this time to guess the correct WPS pin and recover the passphrase.
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